ruby tutorial
Merge pull request #1269 from johand/ruby_book

ruby tutorial
Remove all dead links, close #1257
Added "Linux 101 Hacks" eBook
Merge pull request #1270 from SuperStas/linux_101_hacks_ebook

Added "Linux 101 Hacks" eBook
add one book about python
add one book about python
Merge pull request #1273 from bluemandora/master

add two book about python and php in chinese
Added several courses and books
Merge pull request #1274 from switchhax/master

Added several courses and books
Update free-programming-books-tr.md
Merge pull request #1275 from emraher/patch-1

Update free-programming-books-tr.md
updated url for just enough ruby to get by book
Merge pull request #1276 from serv/master

Updated url for just enough ruby to get by book